Electrical motor drive for centrifugal oil testing machines



Patented June 1, 1937 iJNlTED STATES ELECTRICAL MOTOR DRIVE FOR CENTRIF- UGAL OIL TESTING MACHINES William L. Melton, Overton, Tex, assignor of one-half to D. E. Tex.

France Russell, Overton,

Application October 21, 1936, Serial No. 106,877

3 Claims.

My invention relates to portable centrifugal oil testing machines and more particularly to an electric drive therefor and it consists in the constructions, arrangements and combinations herein described and claimed.

It is the cardinal purpose of the invention to provide a portable electric drive for a centrifuge of a construction which may be suitably mounted upon a motor vehicle driven by a six volt electric motor and deriving its electromotive force from the usual battery of the motor vehicle.

It is also an object of the invention to provide a novel construction of motor so encased as to preclude liability of fire hazards.

It is a still further object of the invention to provide a novel construction of thrust bearing for the armature of the motor.

Additional objects, advantages and features oi invention will be apparent from the following 0 description considered in conjunction with the accompanying drawing, wherein Figure l is an elevational view of the motor, partly in section.

Figure 2 is a cross section on the line 2--2 of Figure 1.

Figure 3 is a detail elevation of the bearing housing.

There is illustrated a motor I B having an armature H, the shaft l2 of which projects upwardly for mounting of any conventional centrifuge oil testing apparatus.

The motor will be mounted in a vertical poiii sition, as shown in Figure l, the base of the motor being open as shown at it, and securely fixed therein, I provide a bearing housing M. The housing M is cylindrical, the vertical wall 15 of which irictionally binds upon the interior of the shell it of the motor and the upper horizontal wall ll of the casing is provided with an opening E8 of a size to freely admit the armature H therethrough. The lower wall l9 of the housing has an integrally formed cup member 2!} projected below the wall it! and houses a ball bearing race The race 2! is in alignment with and receives the lower end of the armature shaft 22. From the structure thus far set forth, it will be apparent that the armature H will be rigidly supported for rotation in a vertical plane.

The housing l is provided with openings 22 in its vertical wall adapted to align with openings 23 of the motor casing, thus permitting access to the brushes and commutator of the motor. An expansible band closure member 24 is employed for closing the openings 23.

Mounted upon the upper face of the wall [9 there is an annular ring 25 circumscribing the cup member 25! serving as a means for mounting four brushes 25 disposed for cooperation with the commutator 2i of the armature.

The casing of the motor is provided with an annular mounting flange 2S, suitably apertured for mounting, by means of bolts, to a wooden base member 29. The base 29 will be formed with a depressed portion 30 accomodating the cup member 20.

The motor will be energized through the usual battery of the motor vehicle, indicated at 3|, through the lead 32 connected to a binding post 33, the ground connection being indicated at w, which preferably will be a portion of the vehicle frame. A switch 35, of any approved construction, may be installed in the line 32 for control of the motor.

From the foregoing it will be seen that I have provided a simplified and practical form of motor drive for a centrifuge, well insulated by the wooden base from direct contact of metallic portions of the motor vehicle, thus eliminating liability of sparks preventing ignition of oil undergoing a test.

I claim:-

1. A drive for centrifuge oil testing machines comprising an electric motor having an armature mounted for rotation in a vertical plane, said motor having a casing open at one end and including a circumferential flange, a cylindrical shell member fixed in the open end of the casing of the motor, the shell having a cup member projecting below the flange, a bearing in the cup 1 member for support of one end of the armature, and an insulator block fixed to the flange and closing the open end of the casing, the block having a depressed portion for accommodation of the cup member.

2. A drive for centrifuge oil testing machines comprising an electric motor having an armature mounted for rotation in a vertical plane, said motor having a casingopen at one end and including a circumferential flange, one end of the shaft of the armature projecting beyond the casing for mounting of a centrifuge, the opposite end having a commutator, a cylindrical shell member fixed in the open end of the casing of the motor and housing the commutator, the shell member having a downwardly disposed cup member, a bearing in the cup mem ber for support of the armature shaft, a ring member mounted in the shell member, said ring member having brushes thereon for cooperation with the commutator, an insulator block fixed to the flange and closing the open end of the easing, .and electromotive means for energizing the motor.

3. The structure of claim 2 wherein the motor casing and shell member have aligned openings permitting access to the commutator and brushes.

WILLIAM L. MELTON. 

